Addition of hexamethylphosphoric triamide to solutions of prop-2-ynyl dilithio-derivatives causes the disappearance of their strong i.r. absorption bands at 1800–1900 cm–1 and the appearance of a medium new band at ca. 2050 cm–1, indicating that a structure trans-formation from an allenic to a sesquiacetylenic form has taken place.
J. Klein and J. Y. Becker, J. Chem. Soc., Chem. Commun., 1973, 576 DOI: 10.1039/C39730000576
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